Can You ‘Catch’ Dementia From Your Spouse? - StudyFinds

What the report says

StudyFinds reported on a large Taiwanese observational study suggesting that people whose spouses are diagnosed with dementia may face a substantially higher chance of later receiving a dementia diagnosis themselves. The study, published in JAMA Network Open in July 2026, used Taiwan’s National Health Insurance Research Database and included 955,105 married people tracked through records from 1998 to 2022. Researchers compared spouses of newly diagnosed dementia patients with matched peers whose partners did not have dementia.

According to the report, women whose husbands had dementia had about a 74% higher relative risk of developing dementia, while men whose wives had dementia had about a 69% higher risk. The association appeared across dementia categories, including Alzheimer’s disease and vascular dementia. In absolute terms over five years, StudyFinds said the risk was roughly 6.5% versus 3.7% for women, and 9.2% versus 5.75% for men, depending on whether their spouse had dementia.

The article emphasized that dementia is not considered contagious. Researchers pointed instead to possible shared factors within couples, such as similar environments, habits, socioeconomic conditions and the stress of caregiving. The report noted wider absolute risk gaps among lower-income spouses and those with fewer children, groups that may have less access to paid or family support.

StudyFinds also highlighted important limits: the study relied on insurance claims rather than clinical testing, lacked data on education and lifestyle, and could not directly measure caregiving strain, sleep loss or stress. The findings may support closer monitoring and support for spouses after a dementia diagnosis, but they do not prove that one partner’s illness causes the other’s.